Tertiary, only in the case that in group A there seems to be evidence of change in TBR at approximately the same session in time as per visual inspection,, we will test a direct replication of this effect in group B using a similar permutation testing method as Ter Kuile et al., (2009, see also Bulté and Onghena, 2008 ) The approximate time-point of TBR change in group A might serve to designate the per-session TBR data as either pre- or post-intervention.